I have a basic series-parallel circuit, it is power by my DC power supply. From the Neg to R1, then to the parallel group of R2 & R3, then to the Pos. Question : Why is it when i measure the series resistance of R1 in the circuit with the power connected ( not turned on) I get a different reading than if I take it right out of the ciruit? Do I have to disconnect the power to read resistance because the power supply is actually in parallel to the series resistor of R1. that would mean the same is taking place with the parallel group but I haven't noticed since I was splitting that up anyhow to measure the resistance there. Is this something I should keep in mind for the future, disconnect the power line to the circuit before measuring resistance - even if only a series resistance.
Thank you in advance one and all... .. Bob